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Sliding filament theory can be best explained as:

1. Actin and Myosin filaments shorten and slide past each other
2. Actin and Myosin filaments do not shorten but rather slide past each other
3. When myofilaments slide pass each other, Myosin filaments shorten while Actin filaments do not shorten
4. When myofilaments slide pass each other Actin filaments shorten while Myosin filament do not shorten

Correct answer: Actin and Myosin filaments do not shorten but rather slide past each other

Solution

In sliding filament theory, actin and myosin keep their own lengths; contraction happens as they slide past each other, increasing overlap. The sarcomere shortens, but the filaments themselves do not.

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